Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) #include <stdio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #include <stdlib.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <dirent.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <fcntl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <sys/stat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <os.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #define UML_DIR "~/.uml/"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #define UMID_LEN 64
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) /* Changed by set_umid, which is run early in boot */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) static char umid[UMID_LEN] = { 0 };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) /* Changed by set_uml_dir and make_uml_dir, which are run early in boot */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) static char *uml_dir = UML_DIR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) static int __init make_uml_dir(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	char dir[512] = { '\0' };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	int len, err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	if (*uml_dir == '~') {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 		char *home = getenv("HOME");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 		err = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 		if (home == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 			printk(UM_KERN_ERR
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 				"%s: no value in environment for $HOME\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 				__func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 			goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 		strlcpy(dir, home, sizeof(dir));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 		uml_dir++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	strlcat(dir, uml_dir, sizeof(dir));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	len = strlen(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	if (len > 0 && dir[len - 1] != '/')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 		strlcat(dir, "/", sizeof(dir));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	uml_dir = malloc(strlen(dir) + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	if (uml_dir == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 		printk(UM_KERN_ERR "%s : malloc failed, errno = %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 			__func__, errno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 		goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	strcpy(uml_dir, dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	if ((mkdir(uml_dir, 0777) < 0) && (errno != EEXIST)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 		printk(UM_KERN_ERR "Failed to mkdir '%s': %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 			uml_dir, strerror(errno));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 		err = -errno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 		goto err_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) err_free:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	free(uml_dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	uml_dir = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76)  * Unlinks the files contained in @dir and then removes @dir.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77)  * Doesn't handle directory trees, so it's not like rm -rf, but almost such. We
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78)  * ignore ENOENT errors for anything (they happen, strangely enough - possibly
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79)  * due to races between multiple dying UML threads).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) static int remove_files_and_dir(char *dir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	DIR *directory;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	struct dirent *ent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	int len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	char file[256];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	directory = opendir(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	if (directory == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 		if (errno != ENOENT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 			return -errno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 			return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	while ((ent = readdir(directory)) != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 		if (!strcmp(ent->d_name, ".") || !strcmp(ent->d_name, ".."))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 		len = strlen(dir) + strlen("/") + strlen(ent->d_name) + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 		if (len > sizeof(file)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 			ret = -E2BIG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 		sprintf(file, "%s/%s", dir, ent->d_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 		if (unlink(file) < 0 && errno != ENOENT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 			ret = -errno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	if (rmdir(dir) < 0 && errno != ENOENT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 		ret = -errno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	closedir(directory);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)  * This says that there isn't already a user of the specified directory even if
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)  * there are errors during the checking.  This is because if these errors
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)  * happen, the directory is unusable by the pre-existing UML, so we might as
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)  * well take it over.  This could happen either by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)  * 	the existing UML somehow corrupting its umid directory
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)  * 	something other than UML sticking stuff in the directory
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)  *	this boot racing with a shutdown of the other UML
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)  * In any of these cases, the directory isn't useful for anything else.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)  * Boolean return: 1 if in use, 0 otherwise.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) static inline int is_umdir_used(char *dir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	char pid[sizeof("nnnnnnnnn")], *end, *file;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	int dead, fd, p, n, err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	size_t filelen = strlen(dir) + sizeof("/pid") + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	file = malloc(filelen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	if (!file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	snprintf(file, filelen, "%s/pid", dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	dead = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	fd = open(file, O_RDONLY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	if (fd < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 		fd = -errno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 		if (fd != -ENOENT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 			printk(UM_KERN_ERR "is_umdir_used : couldn't open pid "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 			       "file '%s', err = %d\n", file, -fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	n = read(fd, pid, sizeof(pid));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	if (n < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 		printk(UM_KERN_ERR "is_umdir_used : couldn't read pid file "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		       "'%s', err = %d\n", file, errno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 		goto out_close;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	} else if (n == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 		printk(UM_KERN_ERR "is_umdir_used : couldn't read pid file "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 		       "'%s', 0-byte read\n", file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 		goto out_close;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	p = strtoul(pid, &end, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	if (end == pid) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 		printk(UM_KERN_ERR "is_umdir_used : couldn't parse pid file "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		       "'%s', errno = %d\n", file, errno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 		goto out_close;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	if ((kill(p, 0) == 0) || (errno != ESRCH)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 		printk(UM_KERN_ERR "umid \"%s\" is already in use by pid %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 		       umid, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) out_close:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	close(fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	free(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192)  * Try to remove the directory @dir unless it's in use.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)  * Precondition: @dir exists.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194)  * Returns 0 for success, < 0 for failure in removal or if the directory is in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195)  * use.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) static int umdir_take_if_dead(char *dir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	if (is_umdir_used(dir))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 		return -EEXIST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	ret = remove_files_and_dir(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 		printk(UM_KERN_ERR "is_umdir_used - remove_files_and_dir "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 		       "failed with err = %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) static void __init create_pid_file(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	char pid[sizeof("nnnnnnnnn")], *file;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	int fd, n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	n = strlen(uml_dir) + UMID_LEN + sizeof("/pid");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	file = malloc(n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	if (!file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	if (umid_file_name("pid", file, n))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	fd = open(file, O_RDWR | O_CREAT | O_EXCL, 0644);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	if (fd < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 		printk(UM_KERN_ERR "Open of machine pid file \"%s\" failed: "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 		       "%s\n", file, strerror(errno));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	snprintf(pid, sizeof(pid), "%d\n", getpid());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	n = write(fd, pid, strlen(pid));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	if (n != strlen(pid))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 		printk(UM_KERN_ERR "Write of pid file failed - err = %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 		       errno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	close(fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	free(file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) int __init set_umid(char *name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	if (strlen(name) > UMID_LEN - 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 		return -E2BIG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	strlcpy(umid, name, sizeof(umid));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) /* Changed in make_umid, which is called during early boot */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) static int umid_setup = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) static int __init make_umid(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	int fd, err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	char tmp[256];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	if (umid_setup)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	make_uml_dir();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	if (*umid == '\0') {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 		strlcpy(tmp, uml_dir, sizeof(tmp));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 		strlcat(tmp, "XXXXXX", sizeof(tmp));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 		fd = mkstemp(tmp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 		if (fd < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 			printk(UM_KERN_ERR "make_umid - mkstemp(%s) failed: "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 			       "%s\n", tmp, strerror(errno));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 			err = -errno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 			goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 		close(fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 		set_umid(&tmp[strlen(uml_dir)]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 		 * There's a nice tiny little race between this unlink and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 		 * the mkdir below.  It'd be nice if there were a mkstemp
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 		 * for directories.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 		if (unlink(tmp)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 			err = -errno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 			goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	snprintf(tmp, sizeof(tmp), "%s%s", uml_dir, umid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	err = mkdir(tmp, 0777);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	if (err < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 		err = -errno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 		if (err != -EEXIST)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 			goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 		if (umdir_take_if_dead(tmp) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 			goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 		err = mkdir(tmp, 0777);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 		err = -errno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 		printk(UM_KERN_ERR "Failed to create '%s' - err = %d\n", umid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 		       errno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 		goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 	umid_setup = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	create_pid_file();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315)  err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) static int __init make_umid_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	if (!make_umid())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	 * If initializing with the given umid failed, then try again with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	 * a random one.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	printk(UM_KERN_ERR "Failed to initialize umid \"%s\", trying with a "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	       "random umid\n", umid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 	*umid = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	make_umid();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) __initcall(make_umid_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) int __init umid_file_name(char *name, char *buf, int len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 	int n, err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 	err = make_umid();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 	n = snprintf(buf, len, "%s%s/%s", uml_dir, umid, name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	if (n >= len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 		printk(UM_KERN_ERR "umid_file_name : buffer too short\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 		return -E2BIG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) char *get_umid(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 	return umid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) static int __init set_uml_dir(char *name, int *add)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 	if (*name == '\0') {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 		os_warn("uml_dir can't be an empty string\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 	if (name[strlen(name) - 1] == '/') {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 		uml_dir = name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 	uml_dir = malloc(strlen(name) + 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 	if (uml_dir == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 		os_warn("Failed to malloc uml_dir - error = %d\n", errno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 		 * Return 0 here because do_initcalls doesn't look at
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 		 * the return value.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 	sprintf(uml_dir, "%s/", name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) __uml_setup("uml_dir=", set_uml_dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) "uml_dir=<directory>\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) "    The location to place the pid and umid files.\n\n"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) );
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) static void remove_umid_dir(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 	char *dir, err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) 	dir = malloc(strlen(uml_dir) + UMID_LEN + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) 	if (!dir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) 	sprintf(dir, "%s%s", uml_dir, umid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) 	err = remove_files_and_dir(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) 		os_warn("%s - remove_files_and_dir failed with err = %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) 			__func__, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) 	free(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) __uml_exitcall(remove_umid_dir);